Clean Water Act discharge permit · NPDES MO0126594
SCCPWSD#2, BOONE RIDGE ESTATES WWTF, Wentzville, MO: NPDES MO0126594 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 9Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
SCCPWSD#2, BOONE RIDGE ESTATES WWTF, held by PWSD #2 of St. Charles County, holds NPDES permit MO0126594, which discharges to Tributary To Peruque Creek. EPA’s file records it issued August 16, 2016 and expiring March 31, 2020. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | SCCPWSD#2, BOONE RIDGE ESTATES WWTF |
|---|---|
| Permittee as filed | PWSD #2 of St. Charles County |
| NPDES ID | MO0126594 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | August 16, 2016 |
| Expiration date | March 31, 2020 |
| Address | Wentzville, MO 63385 |
| Receiving water | Tributary to Peruque Creek |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Headwaters Peruque Creek (HUC 071100090101) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 13Pollutants on file
- 9Under a numeric limit
- 10With a violation of any kind
- 9With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 8 | 2 | 2 | June 30, 2017 | 49% over the limit |
| BOD, 5-day, 20 deg. C | 3 | 2 | 2 | March 31, 2025 | 220% over the limit |
| Ammonia [as N] + unionized ammonia | 0 | 2 | 2 | July 31, 2013 | 162% over the limit |
| Coliform, fecal general | 0 | 2 | 2 | September 30, 2013 | 670% over the limit |
| Solids, total suspended | 3 | 1 | 1 | March 31, 2025 | 96% over the limit |
| pH | 2 | 1 | 1 | September 30, 2008 | |
| E. coli | 2 | 1 | 1 | May 31, 2020 | 511% over the limit |
| BOD, 5-day, percent removal | 0 | 1 | 1 | March 31, 2025 | 40% over the limit |
| Solids, suspended percent removal | 0 | 1 | 1 | December 31, 2025 | 21% over the limit |
| Oil and grease [soxhlet extr.] tot. | 2 | 2 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 0 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 1 | 0 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 1 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MO0126594.
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID MO0126594 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.